This is actually a continuation of an old thread that was closed about 10 months ago. Tim Ellison said they were aware of the issue & that they hoped to have a fix in v1.2. This is to confirm that the problem still exists in v1.3.8.
After a week of heavy operation as W1AW/9, I noticed that about 2-3% of the time there would be no transmit audio when I pushed the footswitch, . The radio would go into transmit mode, but no audio. Releasing footswitch & activating it again always fixed the problem.
73, Ray, K9DUR
Flex-6300, mic audio through front panel connector.
Best, John KB1YFD
But it still happens with the DAX switch turned off. I don't know if there is an actual correlation or not.
It also seems to be happening more in v.1.38 than in the previous software.